Appeal No. 1996-2055
Application No. 08/132,554
The claims relate to a method of producing a glass panel
for a liquid crystal display (LCD) device wherein a
continuous, permanent and transparent film is deposited on a
surface of a glass panel upon exposure of the panel to an
atmosphere of an atomized or ionized inert refractory
material, e.g. silica, and the deposited film functions both
as a parting agent during a heat compaction treatment and as a
barrier layer to prevent sodium ion migration during
subsequent processing steps and during operation of the LCD
(see appellant’s specification: page 7, l. 23-30).
Claim 1 is illustrative and reads as follows:
1. A method of producing a glass panel for a LCD device
wherein the glass is nominally free of alkali metal oxides,
that is, has no intentionally added alkali metal compound in
its batch, but contains up to about 0.1% by weight Na as an+
impurity, and wherein the method comprises depositing on at
least one surface of a clean glass panel a continuous,
permanent, and transparent barrier layer film from an
atmosphere of an atomized or ionized inert refractory
material, or reactive precursor, the film being greater than
50nm, but not over 500nm, in thickness, and, after depositing
the transparent film on the clean glass panel, stacking the
filmed glass panel with a plurality of the clean, filmed glass
panels to form a stack of adjacent panels, the total film
thickness between each pair of adjacent panels in the stack
being greater than 100nm and subjecting the stack to a heat
treatment to compact the glass, the permanent barrier layer
film on the clean glass panel functioning both as a barrier to
sodium ion migration from the glass and as a parting agent
during the compacting heat treatment.
2
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